Influential Analysis of Parameters Variation of Propulsion System on Longitudinal Vibration Response in Liquid Rockets
Tang Ye 1 Fang Bo 1 Zhang Yewei 2, 3 Tan Lijun1 Yu Ziwen 4
1.School of Astronautics, Harbin Institute of Technology, Harbin 150001, China；
2.Shanghai Institute of Applied Mathematics and Mechanics, Shanghai 200072,China；
3. Department of Astronautics, Shenyang Aerospace University, Shenyang 110136,China；
4. Beijing Institute of Astronautical Systems Engineering, Beijing 100076, China
To optimize the propulsion system in liquid rockets, avoid the low frequency vibration environment deterioration of liquid rockets which is caused by POGO vibration has disadvantage effect on the flight course of rocket system, the dynamic model of POGO vibration system in liquid rockets is established, the model of sensitivity analysis that longitudinal vibration response in liquid rockets (LVRILR) with respect to parameters of propulsion system is proposed in the time domain based on the dynamic sensitivity technique. Through numerical calculation, the laws that the inertial parameters variation of fluid, the drag parameters variation of fluid, the stiffness parameters variation of fluid and the dynamic gain variation of pump for propulsion system have an important effect on LVRILR are obtained. The results obtained show the sensitive extent of LVRILR with respect to the inertial parameters of fluid and the drag parameters of fluid is sharply greater than the stiffness parameters of fluid, the influence that the dynamic gain variation of pump has on LVRILR is the maximum, and the influence that the variation of fluid stiffness for the short pipeline which is on pump front has on LVRILR is the minimum. This provides a reference for longitudinal vibration in liquid rockets is reduced and the characteristics of POGO vibration are further researched.
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